After update the changes of the position, call the "invalidate()"
method. This method redraw the canvas.

Regards,
Felix

On Mar 8, 10:11 am, JackeyChan <[email protected]> wrote:
> I only want the ball can move with user input: up , down, left,
> right.
> now , the ball is created by extend the View class and draw it on the
> canvas, then set this to be default activity view.
> but i don't know how to handle user input for re-draw it.
> can anyone give me suggestion ??

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